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    SubjectRe: [PATCH] Mutilated form of Andi Kleen's AMD prefetch errata patch
    Andrew Morton <> writes:

    > Looking at Andi's patch, it is also a dead box if the fault happens inside
    > down_write(mmap_sem). That should be fixed, methinks.

    The only way to fix all that would be to move the instruction checks early
    into the fast path.

    [On a P4 the overhead is 3.7268 vs 3.6594 microseconds for a fault that
    doesn't hit as measured by lmbench2's lat_sig. This was before the latest
    changes which added more checking, so the overhead is probably bigger now]

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